Detector-bar.



N0. 898L169. I PATENTBD JULY 14, 1908.

- J. s. HOB'ASON.

DETECTOR BAR. APPLICATION FILED 0GT.22, 1907.

2 SHEETS-SHEET 1.

No. 893,169. 4 PATENTED JULY 14, 1908.

J. s. 'HOBSON.

. DETECTOR BAR. APPLICATION FILED OCT 22 1907 2 SHEETS-SHEET 2.

JOHN S. HOBSON, EDGEWOOD PARK, PENNSYLVANIA.

DETECTOR-BAR.

Specification of Letters Patent.

Patented July 14, 1908.

Application filed October 22, 1907. Serial No. 398,677.

To all whom it may concern:

Be it known that 1, JOHN S. HoBsoN, a citizen of the United States,residing at Edgewood Park, in the county of Allegheny and State ofPennsylvania, haveinvented certain new and useful Improvements inDetector-Bars, of which the following is a specification.

My invention relates to detector bars, which, as is well known in theart, are used in connection with railway switches.

My invention particularly relates to detector bars located on the insideof a rail as distinguished from the outside of the rail which has beenthe usual arrangement heretofore.

An advantage of using, what may be termed an inside detector bar,resides in the fact that with an inside detector bar all danger of thebar being thrown when a car or train is over it is entirely eliminated,since an inside detector bar would strike directly against the flange ofa car wheel, whereas an outside bar has only that portion of the wheelprojecting beyond the rail head to engage. Thus a greater factor ofsafety is obtained by the use of an inside detector bar.

I will describe a detector bar embodying my invention and then point outthe novel features in claims.

In the accompanying drawings, Figure 1 is a side elevation of an insidedetector bar embodying my invention. Fig. 2 is a vertical crosssectional view taken on the line 22 of Fig. 1. Fig. 3 is a verticalcrosssectional view taken on the line 33 of Fig. 1. Fig. 4 is a detailview, in side elevation of a modified form of motion late in connectionwith a detector bar an embodyin my invention. Fig. 5 is a verticalsectiona view taken on the line 55 of Fig. 4.

Similar letters of reference deslgnate corres onding parts in all of thefigures.

designates a railroad rail, and B a wheel of a car traveling along therail. C designates a detector bar which as shown is located alongsidethe rail A in such position as to engage the flange of the wheel B whenit is raised. This arrangement necessitates the detector bar beingarranged on the inside of the rail. As shown the detector bar C is madefrom a channel iron or from two or more pieces 0 of angle iron which arebolted or riveted together at suitable points in such manner as to forma channel bar or to be U-shaped in cross section. The detector bar issupported in position alongside the rail by means of one or more clips Dwhich are suitably secured by bolts d to the rail. Means are rovidedbetween the bar and clip for causing the bar to rise and fall along therail, as well as means for preventing lateral and vertical displacementof the bar relatively to the rail. The clips D of Figs. 1 and 2, asshown, comprise two upright portions or walls (1, (Z and a cam surface(1 having oppositely inclined sides.

J ournaled within the side walls of the detector bar is one or morerollers 0 (according to the number of clips D employed) which aredesigned to travel up and down the oppositely inclined sides of the camsurface (Z when the detector bar is moved longitudinally by any desiredmeans. The walls d, d of the clips prevent any lateral movement of thedetector bar, and means are also provided for preventing the detectorbar being lifted out of the clips. As shown in Figs. 1 and 3, thesemeans take the form of bolts or pins E provided at intervals in thedetector bar. 'ject beyond the detector bar in such position as toengage the head of the rail when the detector bar is lifted vertically.If desired the cam surface may be carried by the detector bar and theroller by the clip.

Referring now to Figs. 4 and 5, the same form of detector bar is used,while a diiferent form of clip is employed. In addition to the camsurface (1 an angular groove d (preferably conforming to the cam surfaced is employed in which an end or head of the journal in of the rollers 0projects. The groove (1 and head of the pin are for the same function asthe pins or bolts E and also for the purpose of forcing the detector bardownward after The ends of the bolts or pins E proit has passed over theapex of the cam surroller travels, and means for limiting the 10 face dupward movement of the bar.

Having thus described my invention, what In testimony whereof I havesigned my I claim as new is name to this specification in the presenceof The combination with a detector bar U- two subscribed witnesses.shaped in cross-section, of a roller journaled JOHN S. HOBSON. in theWalls of the detector bar, a clip for sup- Witnesses: porting said barin position, said cli having W. L. MODANIEL,

side walls and a cam surface over w ich the R. L. KIsTLER.

